13 A disc is placed on a surface of pond which has refractive index 5 3 A source of light is placed 4 m below the surface of

Question

13 A disc is placed on a surface of pond which has refractive index 5 3 A source of light is placed 4 m below the surface of liquid The minimum radius of disc needed so that light is not coming out is b 3 m d 4m a o c 6 m CBSE PMT 2001

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